Alert archive / South Dakota / Mesoscale Discussions in 2012

Mesoscale Discussion 1247

June 22, 2012Cherry County, Dawes County, Sheridan County, Nebraska; 13 counties in South Dakota; Crook County, Weston County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jun 22, 2012, 8:36 PM MDT for Cherry County, Dawes County, Sheridan County, Nebraska; 13 counties in South Dakota; Crook County, Weston County, Wyoming. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Jun 22, 2012, 8:36 PM MDT (02:36 UTC)
Expired: Jun 22, 2012, 10:00 PM MDT
In force: 84 min
Issued by: the Storm Prediction Center

Counties Cherry County, NE, Dawes County, NE, Sheridan County, NE, Bennett County, SD, Custer County, SD, Fall River County, SD, Haakon County, SD, Jackson County, SD, Jones County, SD, Lawrence County, SD, Meade County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Todd County, SD, Tripp County, SD, Crook County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 48 km from the middle of the area, began a volume at 02:36 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 2.6 hours before the alert went out and 43 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2140 J/kg
Mixed-layer CIN: -85 J/kg
Mixed-layer LCL: 2194 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 22, 6:52 PM MDT	Mesoscale Discussion	SPC	Arthur, Banner, Box Butte, Chase, Cheyenne, Deuel and 9 more	83 min
Jun 22, 10:03 PM MDT	Mesoscale Discussion	SPC	Arthur, Blaine, Brown, Chase, Cherry, Custer and 14 more	87 min
Jun 22, 10:43 PM MDT	Mesoscale Discussion	SPC	Blaine, Boyd, Brown, Cherry, Garfield, Holt and 3 more	92 min
Jun 23, 12:18 AM MDT	Mesoscale Discussion	SPC	Adams, Antelope, Blaine, Boone, Boyd, Brown and 65 more	87 min

Nearby

Mesoscale Discussions in South Dakota, 2012 Mesoscale Discussions in Nebraska, 2012 Mesoscale Discussions in Wyoming, 2012 Every mesoscale discussion in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.